The Kele HZLIM Series explosion proof high and low limit controls are field-assembled combinations of industry standard controls, heavy duty explosion proof enclosures, and seals for use in atmospheres that may contain hazardous gases or dusts (Groups B, C, D, E, F). The HZLIM-LO-A includes the ultra reliable A11A-1 manual reset low limit control, a XJA7514C2M2M explosion proof enclosure, two EYM-75 conduit seals, and an ACK6F fiber/cement kit. The HZLIM-LO-B is identical to the HZLIM-LO-A but includes the equally reliable A11B-1 automatic reset low limit control instead of the A11A-1. The HZLIM-HI is also identical to the HZLIM-LO-A but includes the time proven A70KA-1 manual reset high limit control in place of the A11A-1.